H
- Haarlem
- Habacuc (Habakkuk)
- Habit
- Habor
- Haceldama
- Hadrian
- Hadrumetum
- Haggith
- Hagiography
- Hail Mary
- Hair (In Christian Antiquity)
- Hairshirt
- Haiti
- Haito
- Hakodate
- Hakon the Good
- Halicarnassus
- Halifax
- Hamar
- Hamatha
- Hamburg
- Hamilton, Ontario
- Hammurabi
- Hanover
- Hans Baldung
- Hans Burckmair
- Hans Decker
- Hans Holbein (The Elder)
- Hans Leonhard Schaufelin
- Hans Memling
- Hans Niessenberger
- Happiness
- Harbor Grace
- Hare Indians
- Harmony
- Harney
- Harold Bluetooth
- Harpasa
- Harrisburg
- Harrowing of Hell
- Hartford
- Hartman von Aue
- Hartmann Schedel
- Hatred
- Hatto
- Hauara
- Haudriettes
- Hautecombe
- Hauteserre
- Havana
- Haymo
- Haymo of Faversham
- Heaven
- Heber MacMahon
- Hebrew Bible
- Hebrew Language and Literature
- Hebrew Names
- Hebrew Poetry of the Old Testament
- Hebron
- Hector Berlioz
- Hector Boece
- Hector St. John de Crevecoeur
- Hedonism
- Heeremann von Zuydwyk
- Heeswijk
- Hegelianism
- Heiligenkreuz
- Heilsbronn
- Heinrich Bernhard, Freiherr von Andlaw
- Heinrich Birnbaum
- Heinrich Blyssen
- Heinrich Brewer
- Heinrich Bruck
- Heinrich Cornelius Agrippa of Nettesheim
- Heinrich Der Glichezare
- Heinrich Joseph Dominicus Denzinger
- Heinrich Joseph Wetzer
- Heinrich Klee
- Heinrich Roth
- Heinrich Seuse Denifle
- Heinrich von Ahaus
- Heinrich von Dissen
- Heinrich von Laufenberg
- Heinrich von Meissen
- Heinrich von Melk
- Heinrich von Veldeke
- Heinrich Wangnereck
- Heinrich Weber
- Heinrich, Freiherr von Ferstel
- Heisterbach
- Helen More
- Helena
- Helena Tarabotti
- Helenopolis
- Heli (Eli)
- Helie de Bourdeilles
- Helinand
- Heliogabalus
- Hell
- Helmold
- Hendrik Conscience
- Henoch
- Henoticon
- Henri and Jules Desclee
- Henri de Saint-Ignace
- Henri Didon
- Henri Faraud
- Henri Francois Xavier de Belsunce de Castelmoron
- Henri Perreyve
- Henri Raymond Casgrain
- Henri Spondanus
- Henri Valois
- Henri Victor Regnault
- Henri, Count of Boulainvilliers
- Henri, Duc de Joyeuse
- Henri-Alexandre Wallon
- Henri-Etienne Sainte-Claire Deville
- Henri-Francois Daguesseau
- Henri-Joseph Crelier
- Henri-Marie-Gaston Boisnormand de Bonnechose
- Henricus Canisius
- Henry Abbot
- Henry Augustus Rawes
- Henry Balme
- Henry Bard
- Henry Beaufort Plantaganet
- Henry Bedford
- Henry Benedict Maria Clement Stuart
- Henry Bradshaw
- Henry Chichele
- Henry Cole
- Henry Conwell
- Henry Cosgrove
- Henry de Bracton
- Henry Digby Beste
- Henry Edward Cardinal Manning
- Henry Essex Edgeworth
- Henry Fitzalan
- Henry Fitzsimon
- Henry Foley
- Henry Formby
- Henry Garnet
- Henry Glarean
- Henry Harland
- Henry Herp
- Henry Holden
- Henry Ignatius Dudley Ryder
- Henry II (King of England)
- Henry III
- Henry IV
- Henry IV
- Henry James Anderson
- Henry James Coleridge
- Henry Knighton
- Henry Lemcke
- Henry Moore Jackson
- Henry More
- Henry Noris
- Henry Nutcombe Oxenham
- Henry of Friemar
- Henry of Ghent
- Henry of Herford
- Henry of Huntingdon
- Henry of Kalkar
- Henry of Langenstein
- Henry of Noerdlingen
- Henry of Rebdorf
- Henry Pendleton
- Henry Robert Stephens
- Henry Rutter
- Henry V
- Henry VI
- Henry VIII
- Henry Weedall
- Henry William Wilberforce
- Heortology
- Hephaestus
- Heptarchy
- Heraclas
- Heraclea
- Herbart and Herbartianism
- Herbert Goldsmith Squiers
- Herbert of Bosham
- Herbert Vaughan
- Herder
- Heredity
- Herenaus Haid
- Heresy
- Heribert
- Heriger of Lobbes
- Herman Schaepman
- Herman Scholliner
- Herman von Mallinckrodt
- Hermann Busembaum
- Hermann Cohen
- Hermann Contractus
- Hermann Hueffer
- Hermann I
- Hermann of Altach
- Hermann of Fritzlar
- Hermann of Minden
- Hermann of Salza
- Hermann Rolfus
- Hermann Streber
- Hermann Thryaus
- Hermann von Kerssenbroch
- Hermann von Vicari
- Hermas
- Hermeneutics
- Hermits
- Hermits of St. Augustine
- Hermon
- Hermopolis Magna
- Hermopolis Parva
- Hernando Cortes
- Hernando de Soto
- Herod
- Herodias
- Heroic Act of Charity
- Heroic Virtue
- Herrad of Landsberg
- Herregouts
- Hersfeld
- Herve-Auguste-Etienne-Albans Faye
- Hesebon
- Hesse
- Hesychasm
- Hesychius of Alexandria
- Hesychius of Jerusalem
- Hesychius of Sinai
- Hethites
- Hexaemeron
- Hexapla
- Hexateuch
- Hexham and Newcastle
- Hierapolis
- Hierarchy
- Hierarchy of the Early Church
- Hierocaesarea
- Hieronymites
- Hieronymus Balbus
- Hieronymus Emser
- Hieronymus Fabricius
- Hieronymus Medices
- Hierotheus
- High Altar
- Hilarius of Sexten
- Hildebert of Lavardin
- Hildesheim
- Hilduin
- Hillel
- Himeria
- Himerius
- Hincmar, Archbishop of Reims
- Hincmar, Bishop of Laon
- Hinduism
- Hippo Diarrhytus
- Hippo Regius
- Hippolyte Delaroche
- Hirena
- Historical Criticism
- History of China
- History of Dogmatic Theology
- History of Marriage
- History of Medicine
- History of Physics
- History of the Christian Altar
- History of the Jesuits (1773-1814)
- History of the Jews
- History of Toleration
- Hobart
- Hohenburg
- Holiness
- Hollanders in the United States
- Holocaust
- Holy Alliance
- Holy Coat
- Holy Communion
- Holy Cross Abbey
- Holy Ghost
- Holy Innocents
- Holy Nails
- Holy Name of Jesus
- Holy Oils
- Holy Orders
- Holy Saturday
- Holy See
- Holy Sepulchre
- Holy Simeon
- Holy Synod
- Holy Water
- Holy Water Fonts
- Holy Week
- Holy Year of Jubilee
- Holyrood Abbey
- Holywell
- Homes
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- Homiletics
- Homiliarium
- Homily
- Homoousion
- Hong-Kong
- Honoratus a Sancta Maria
- Honore Fabri
- Honore Tournely
- Honorius of Autun
- Honour
- Hood
- Hope
- Hopi Indians
- Horacio Carochi
- Hortulus Animae
- Hosanna
- Hosius of Cordova
- Hospice
- Hospice-Anthelme Verreau
- Hospital Sisters of the Mercy of Jesus
- Hospitality
- Hospitallers
- Hospitals
- Host
- Hottentots
- House of Guise
- House of Malatesta
- House of Medici
- Hroswitha
- Huajuapam de Leon
- Huanuco
- Huaraz
- Hubert and Jan van Eyck
- Hubert Walter
- Hubert-Andre Dumont
- Hucbald of St-Amand
- Huelgas de Burgos
- Huesca
- Hug
- Hugh and Leo Etherianus
- Hugh Capet
- Hugh Green
- Hugh MacCaghwell
- Hugh O'Neill
- Hugh O'Reilly
- Hugh of Digne
- Hugh of Flavigny
- Hugh of Fleury
- Hugh of Remiremont
- Hugh of St-Cher
- Hugh of St. Victor
- Hugh of Strasburg
- Hugh Oldman
- Hugh Paulinus Serenus Cressy
- Hugh Tootell
- Hugh Ward
- Huguccio
- Huguenots
- Human Acts
- Human Race
- Humanism
- Humbert of Romans
- Humbert-Guillaume de Precipiano
- Humeral Veil
- Humiliati
- Humility
- Humphrey Berisford
- Hungarian Catholics in America
- Hungarian Literature
- Hungary
- Hunting
- Huron Indians
- Hurter
- Hussites
- Hyacinthe de Valroger
- Hyacinthe Sigismond Gerdil
- Hyacinthe-Louis de Quelen
- Hydatius of Lemica
- Hyderabad-Deccan
- Hylozoism
- Hymn
- Hymnody and Hymnology
- Hypaepa
- Hypnotism
- Hypocrisy
- Hypostatic Union
- Hypsistarians
- Hyssop
- St. Hedwig
- St. Hegesippus
- St. Helena
- St. Henry II
- St. Hereswitha
- St. Heribert
- St. Hermengild
- St. Hermes
- St. Hilarion
- St. Hilary of Arles
- St. Hilary of Poitiers
- St. Hilda
- St. Hippolytus of Rome
- St. Honorius
- St. Hubert
- St. Hugh
- St. Hugh the Great
- St. Hyacinth
- St. Hyacintha Mariscotti
- The Hague
- The Heliand
- The High Priest
- The Highest Good
- The Holy Grail
- The Holy Lance
- The Hon. George Spencer